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UNITED STATES rarer? orrron.

RBBERTLEELEAT'I-IERMANANDFRANK rrnoenn t, onivrouiv'r PLEASANT, PENN- V SYLVANIA.

ADJUSTABLE SEAT.

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' Seats, of which the following is a speci fication. v V V This invention has relation to adjustable school chairs, and has for an object to provide a chair,- with means embodied therein to permit its verticaladjustment inopposite directions to adapt the same to the size'of the pupil.

A. still further object of the invention is to provide a chair of thecharacter above described, embodying means for permitting vertical adjustment of the seat thereof, and means for adjusting the seat toward and away from a desk, the seat support being adapted to be secured to the floor in the usual manner of. school furniture.

In addition: to the foregoing, this invention; 'comprehends. improvementsin the details; of. construction. and. arrangement of parts to be hereinafter described and particularly pointed out in the appended claims.

In the accompanyingdrawings, in which similar and corresponding parts are designated by the same character of reference throughout the several views in which they appear Figure 1 is a View in side elevation of an improved chair constructed in accordance with our invention.

Fig. 2 is a detail view in vertical section of the seat and supporting member of our improved chair.

Fig. 3 is a view in section taken on the line 3-3 of Fig. 2.

Fig. 4 is a view in plan of an intermediate member of the seat.

Fig. 5 is a view in member of the seat;

Fig. 6 is aside view of a chair constructed in accordance with the present invention, showing a modified form of supporting the same in adjusted position. i

Fig. 7 is a detail sectional view on line 77 of Fig. 6. 1

With reference to the present illustration this improved chair includes a standard 32 which is of a tubular construction, disposed plan of the bottom Specification of Letters Patent:

Patented Dec; 23, 1919*.

Application filed April 22, 1918. Serial No. 230,077.

vertically and formed at its bottom with. a suitable base 33, apertured to permitsecuring it to the floor.: The" standard is. internally threaded to receive a complementary threaded shaft having, the seat, designated as anentiretyat 35, secured to the top thereof.v The seat comprises a bottom board 36,'an intermediate and a top'board 37 and 38 respectively. The bottom board is secured to the shaft 34 and is provided upon itsupper face with four upstanding pins 39 arranged in rectangular formation so as to be received within a circular groove 40 formed in the under side of the intermediate board which is placed in contact with the bottom board. The depth of the groove is such as to dispose the intermediate andbottom boards in. spaced relation when thepins are in saidgroove; and to permit the intermediate.- board to rest upon. the bottom about eachpin whereby to'urge, the boards toward separation. The intermediate board is formed witha pair of parallel slots 43 at opposite sides of the center, and upon, its

upper face with a. pair of parallel enlargements 44 whichare atopposite sides of the center and which are parallel to the. slots. The upper face of the enlargements are furthermore serrated, as at 45', for coaction with similar serrated faces of enlargement 46 formed upon'the under face of the top board 38, bolts 47 are passed through openings in the top board and through the slots 43 to receive nuts which bear against the under side of the intermediate board to hold said board and the top board together. A back rest 48 may be secured to the top board if desired.

To look the threaded shaft against movement subsequent to adjustment of the seat to the required height, means provided which comprises a band of resilient material 48, which is wrapped around the upper portion of the standard, with one end riveted thereto, and the other end provided with a pin 49 to enter an aperture in the standard. The pin also enters a vertical groove. 50 formed in the threaded shaft whereby, the

' shaft is held against rotation when the pin be held against movement when the seat is not occupied by providing hooks 51, pivoted to the edges of the intermediate board, for engagement with pins 52 secured to the edges of the bottom board.

It will be seen that the base of the chair may be permanently secured to the floor to suit the requirements of the pupil or user of average size, and to move the seat toward or away from a desk it is only necessary to loosen the bolts, 47, whereupon the top board may be moved relative to the intermediate board and the bolts tightened when the proper adjustment is made.

will be in the recesses when the seat is adjusted squarely in front of a desk, so that when the user rises and the seat is relieved of its weight, the top and intermediate boards may be rotated relative to the botseat a quarter of a revolution.

In the modification shown in Figs. 6 and 7 the locking means for retaining the chair in its adjusted position comprises a resilient strip 50 that is secured as at 51 to the standard 32 and has a pin 53 for engagement with apertures 54in the shaft 34 of the seat.

Thus it will be seen that a chair possessing the novel features of construction has been provided which is especially adapted for 5 use in schools to permit its adjustment to a desk so as to insure the correct hygienic position of the pupil before the desk, thereby preventing many deformities and causes of ill health which are the result of an incorrect posture.

The seat 15 should be so constructed that the pins 39 tempera While the illustration and description of this invention is confined to a certain degree of particularity it is to be-realized that in practice various alterations and changes may be made, and therefore the right and privilege of changing the form of the details of construction and otherwise altering the arrangement of the correlated parts is reserved without departing from the spirit of the invention or the scope of the appended claims.

Having thus described our invention, what is claimed as new and upon which Letters Patent are solicited is:

1. A chair, including a standard, a shaft mounted in the standard for vertical movement, a seat including a lower an intermediate and an upper board, pins mounted in the lower board, the intermediate board having a circumferential groove and recesses in the groove to receive the pins, springs encircling the pins to urge the lower and intermediate boards toward separation, said groove permitting relative rotary movement of said boards, serrated enlargement for mutual engagement on the adjacent faces of the intermediate and upper boards, and means for retaining said boards against movement subsequent to adjustment.

2. The combination in a chair, of a shaft, a lower seat member secured to said shaft, an intermediate seat member held to said lower member, springs interposed between said members to urge them apart, an upper seat member, and means to adjustably connect said upper and intermediate members.

In testimony whereof we aflix our signatures.

ROBERT LEE LEATHERMAN. FRANK PFROGNER. 

